Manufacturing method of nonanol
Nonanol is an important organic chemical raw material, which is widely used in the fields of synthetic spices, plastic plasticizers, ink stabilizers and so on. This article will introduce the manufacturing method of nonanol, including raw material preparation, reaction process, post-treatment and other process steps.
I. Raw material preparation
The manufacture of nonanol requires the preparation of the following raw materials:
1. n-nonanal: as the main reactant, n-nonanal can be produced by petrochemical route or bio-fermentation route.
2. Hydrogen: used as a reducing agent to reduce n-nonanal to nonanol.
3. Catalyst: metal catalysts such as nickel and copper are usually chosen to improve the reaction rate and selectivity.
II. Reaction process
Nonanol is mainly manufactured by hydrogenation reduction method, the specific steps are as follows:
1. Add n-nonanal and catalyst into a high-pressure reactor, pass hydrogen gas, and maintain a certain temperature and pressure.
2. Under the action of catalyst, n-nonyl aldehyde and hydrogen gas undergo addition reaction to produce nonanol.
3. Control the reaction temperature and pressure to avoid excessive hydrogenation to generate by-products.
3. Post-treatment
After the completion of the reaction, it is necessary to carry out post-treatment to obtain the nonanol product with high purity, the specific steps are as follows:
1. Cool down the reactor, stop the passage of hydrogen, and discharge the reaction liquid.
2. Distill the reaction liquid to separate the unreacted n-nonenal and nonanol.
3. Remove acidic impurities from the reaction solution by alkaline washing, and then wash with water to neutral.
4. Distill the washed nonanol to obtain nonanol product with high purity.
4. Precautions
1. During the operation, the reaction temperature and pressure should be strictly controlled to avoid excessive hydrogenation to generate by-products.
2. The selection of catalyst and the amount of catalyst used has a great influence on the reaction rate and selectivity, and needs to be optimized according to the actual situation.
3. In the post-treatment process, product quality and purity should be ensured to avoid introducing new impurities.
In short, the manufacture of nonanol needs to master the process steps of raw material preparation, reaction process and post-treatment, and pay attention to the control of reaction conditions and product quality, in order to ensure the smooth production and obtain high-quality nonanol products.
